Abstract
This thesis develops a sensorless permanent-magnet synchronous motor (PMSM) drive for electric vehicle (EV) having grid-to-vehicle and vehicle-to-home operation capabilities. The established power circuit consists of a one-lag bidirectional front-end DC/DC converter and a three-phase inverter. The former allows the battery to establish boosted DC-link voltage for the followed inverter in discharging, and to be charged from the mains or the motor during regenerative braking. All the control algorithms of both power stages are realized digitally using digital signal processor. In road driving mode, the properly designed standard controlled PMSM drive possesses satisfactory operation performance, including starting, acceleration, dynamic and regenerative braking characteristics. In addition, the DC-link voltage boosting, commutation instant tuning and field weakening approaches can further enhance the performance under higher speeds. To avoid making the rotor absolute position sensing, this thesis is also motivated to develop a hybrid sensorless control PMSM drive for EV propulsion. In the developed control scheme, the motor is first started under high-frequency signal injection (HFI) sensorless control. Then the operation is changed to the one applying observed extended back electromotive force (EEMF) approach. The established sensorless controlled PMSM drive possesses the compromised performance of easy to start and good operation characteristics under high speeds. The comparative experimental performance evaluation of the PMSM drive with standard and sensorless controls are also conducted. In idle condition, the power circuit of the developed PMSM drive can be rearranged to perform G2V and V2H operations. For the former case, an on-board charger is formed. It allows the battery be charged from mains with good charging performance and line drawn power quality. The AC line input voltage can be either 220V or 110V. As to the V2H operation, a single-phase three-wire (1P3W) inverter is constructed. The 60Hz 220V/110V AC output voltages with good waveform quality are generated from the battery via proper control. Some experimental results are provided to demonstrate the operation characteristics of the established PMSM drive under various operation modes.